31 Ara 2024 Salı
Biorational management of leaf feeding insect pests of cabbage
Abstract :The research work was conducted in the experimental field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from October, 2020 to February, 2021 to evaluate the effectiveness of some biorationals against leaf feeding insect pests of cabbage. Six treatments, viz. T1 (Spinomax 45SC @ 0.5 ml/L of water at 7 days interval); T2 (Biomax 1.2EC @ 2.0 ml/L of water at 7 days interval); T3 (Bioneem plus 1EC @ 3 ml/L of water at 7 days interval); T4 (Antario @ 2.0 g/L of water at 7 days interval); T5 (Fytomax @ 2.0 ml/L of water at 7 days interval) and T6 (untreated control) were tested in a Randomized Complete Block Design (RCBD) with four replications. Among the management practices, the lowest percentage of leaf infestation of cabbage by tobacco caterpillar (9.58%) and jute hairy caterpillar (6.88%) was found in T1 treated plot that reduced the highest leaf infestation over control (72.73% and 68.67%, respectively); whereas the highest percentage infestation by tobacco caterpillar (35.13%) and jute hairy caterpillar (21.96%) was found in untreated plot (T6). The lowest mean incidence of tobacco caterpillar (5.74 larvae/6 plants) and jute hairy caterpillar (4.15 larvae/6 plants) was found in T1 that reduced highest incidence over control (49.52% and 58.95%, respectively); whereas the highest values of all these parameters were achieved from untreated control treatment (T6). The lowest cabbage head infestation (23.64%) was recorded in T1, that gave the highest yield of cabbage (75.80 t ha-1) and increased the highest yield over control (96.93%). From the above study, it was found that the treatment T1 comprised of Spinomax 45SC @ 0.5 ml/L of water at 7 days interval gave the highest performance compared to those of all other treatments used in the present study. Spinomax 45SC may be used for the management of leaf feeding insect pests of cabbage.
Biorationals, leaf feeding insect pests, cabbage, infestation, yield